CN111306933A - Staged combustion method for saving coal and reducing nitrogen during combustion of rotary cement kiln - Google Patents
Staged combustion method for saving coal and reducing nitrogen during combustion of rotary cement kiln Download PDFInfo
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- CN111306933A CN111306933A CN202010112850.6A CN202010112850A CN111306933A CN 111306933 A CN111306933 A CN 111306933A CN 202010112850 A CN202010112850 A CN 202010112850A CN 111306933 A CN111306933 A CN 111306933A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/42—Arrangement of controlling, monitoring, alarm or like devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/36—Arrangements of air or gas supply devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0006—Monitoring the characteristics (composition, quantities, temperature, pressure) of at least one of the gases of the kiln atmosphere and using it as a controlling value
- F27D2019/0012—Monitoring the composition of the atmosphere or of one of their components
- F27D2019/0015—Monitoring the composition of the exhaust gases or of one of its components
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
- F27D2019/0028—Regulation
- F27D2019/0034—Regulation through control of a heating quantity such as fuel, oxidant or intensity of current
- F27D2019/004—Fuel quantity
- F27D2019/0043—Amount of air or O2 to the burner
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Abstract
The invention discloses a staged combustion method for saving coal and reducing nitrogen during combustion in a rotary cement kiln, which is characterized in that the method sequentially divides flame of a combustor into three areas from beginning to end by changing the oxygen concentration of primary air and carrying out directional accurate oxygen-enriched air combustion supporting on the flame formed by the combustor of the rotary kiln: the pulverized coal volatile matter oxygen-deficient combustion area, the coke initial-stage combustion area and the coke sufficient combustion area realize the staged combustion of the rotary kiln, thereby not only obviously reducing the generation amount of nitrogen oxides, but also improving the combustion environment of the rotary kiln combustion zone, reducing the coal consumption, reducing NOx and improving the clinker quality.
Description
Technical Field
The invention relates to the technical field of kiln combustion, in particular to a coal-saving nitrogen-reducing staged combustion method applied to combustion of a rotary cement kiln.
Background
In recent years, domestic cement industry systems are under double pressure of industry competition and environmental protection policy, and in order to reduce NOx emission indexes, a staged combustion technology is derived. The technical measures of staged combustion are mainly adopted in the industry to reduce the generation amount of NOx, and a great deal of engineering practice shows that staged combustion has obvious effect on reducing the generation amount of NOx. Staged combustion with a division intoAir staged combustion and fuel staged combustion. The traditional staged combustion technology is to reduce the excess air coefficient of primary air at the initial combustion stage of fuel, form an oxygen-deficient environment at the initial combustion stage of pulverized coal to present a reducing atmosphere, and reduce NOx generated by subsequent combustion into N2. But the oxygen-deficient environment can cause the post combustion of the coal powder. The second stage of coal powder combustion, namely the initial combustion stage of coke, is in an oxygen-deficient combustion state, and the combustion stage of the volatile matters in the prior art artificially creates an oxygen-deficient environment, so that the post combustion of the coal powder is intensified by the superposition of the two stages, the firepower is reduced, and the coal consumption is increased.
Disclosure of Invention
In order to solve the technical problems, the invention provides a staged combustion method for saving coal and reducing nitrogen during combustion of a rotary cement kiln, which can improve the combustion speed and the burnout rate of coal powder in the rotary kiln, enhance the firepower, reduce the coal injection amount and reduce the coal consumption under the precondition of stabilizing the quality of the current clinker; and the generation of NOx in the kiln can be greatly reduced, the contradiction between energy conservation and emission reduction is reconciled, and a win-win situation of energy conservation and emission reduction unification is formed.
The invention is realized by the following technical scheme: a staged combustion method for saving coal and reducing nitrogen during combustion in a rotary cement kiln, which is characterized in that,
the oxygen concentration of primary air is changed, and the flame formed by the rotary kiln burner is directionally and accurately supported by oxygen-enriched air, so that the flame of the burner is sequentially divided into three areas from beginning to end: a coal powder volatile matter oxygen-deficient combustion area, a coke initial combustion area and a coke full combustion area.
The method is characterized in that primary air (air which is supplied by a primary fan at the kiln head part and is sprayed into the rotary kiln through a burner) is formed by mixing two paths of air with different oxygen concentrations, one path is common air, the other path is oxygen-deficient air with the oxygen concentration lower than 20.9%, and the air volume of the mixed primary air meets the requirement of the air speed of internal air and external air required by flame shape adjustment. On the premise of meeting the requirement of combustion regulation of volatile matters of the pulverized coal, the primary air oxygen concentration is reduced as much as possible, and the oxygen-deficient combustion of the volatile matters is realized.
The device is characterized in that the two air branch pipes with different oxygen concentrations are respectively provided with an electric regulating valve, and an oxygen concentration detector is arranged on an outlet pipeline of the primary air fan. Under the control of a PLC system, air inlet valves of two paths of air with different oxygen concentrations are adjusted according to the air volume and the oxygen concentration requirements of primary air, so that the accurate control of the air volume and the oxygen content of the primary air is realized.
The method is characterized in that the rotating speed of the high-temperature fan is reduced according to a certain frequency and speed, the air quantity of the system is reduced, the temperature of secondary air (hot air temperature of the secondary air, the secondary air is obtained by suction of the high-temperature fan, enters the rotary kiln from the head of the rotary kiln and moves towards the direction of the preheater) is reduced by the air quantity of the system, the pyrolysis temperature of pulverized coal is further increased, and the staged combustion effect (namely the under-oxygen atmosphere intensity in the combustion stage of the volatile matters of the pulverized coal) is improved.
The method is characterized in that high-pressure oxygen-enriched air with oxygen concentration higher than 20.9% is introduced from the outside and is sprayed into the initial combustion area of the flame coke of the burner through a plurality of groups of nozzles, the original oxygen-deficient combustion state of the part is changed, and the combustion speed and the temperature of the coal powder at the part are larger than or equal to those of the full combustion area of the coke.
The method is characterized in that the temperature of a cylinder of the rotary kiln (the angle of the rotary kiln is inclined by 3.5 degrees with the horizontal direction) is recorded and analyzed through intelligent online analysis software, the shape (length and thickness) of flame of the burner is changed by adjusting the opening of the electric regulating valve for the internal air quantity and the external air quantity of the burner and the opening of the electric regulating valve for the internal air angle and the external air angle of the burner so as to meet the firing requirement, and the defects of partial cylinder temperature higher and lower conditions, flame thinning and lengthening caused by oxygen deficiency combustion and the like are eliminated or improved.
It is characterized by that an on-line flue gas analyzer is added in the tail smoke chamber of rotary kiln, and the waste gas condition produced by combustion of rotary kiln can be monitored at all times, and its composition (O) can be monitored according to the waste gas2、CO、NOX) The adjustment direction of the primary air oxygen concentration and the oxygen-enriched injection quantity is judged.
The method is characterized in that all the adjusting processes can be analyzed and controlled by a computer through software to find out the optimal control and adjustment parameters, so that the benefits of saving coal, reducing nitrogen, increasing production and improving quality are maximized.
The working principle is as follows: by means of a control programThe oxygen concentration of primary air is adjusted dynamically, the oxygen concentration of the primary air is reduced to cause that coal powder is burnt to generate an oxygen-deficient environment and a reducing atmosphere so as to reduce NOx generated in the burning process, and because the oxygen content of the primary air is reduced and the coal powder is burnt to be delayed, flame of a burner is elongated and thinned, firepower is reduced, and the burning effect is reduced; the intelligent operation system utilizes the automatic control program again to carry out oriented and accurate oxygenation combustion supporting on the proper part of the initial combustion of the pulverized coal coke, and the combustion hysteresis of the pulverized coal is eliminated; the automatic control system adjusts the air quantity and the angle of the inner air and the outer air of the burner according to the requirements, changes the width and the length of the flame and eliminates the condition that the flame is thinned due to the reduction of the burning speed of the pulverized coal; meanwhile, the automatic control program reduces the rotating speed of the high-temperature fan and the air quantity of the system according to a certain frequency and speed, the air quantity of the system is reduced, the temperature of secondary air is increased, the pyrolysis temperature of pulverized coal is further increased, and the staged combustion effect (namely the oxygen deficiency atmosphere intensity in the combustion stage of pulverized coal volatile matters) is improved. The result of the mutual influence of the four can pass the smoke chamber gas detection value O2The concentration of CO and NOx reacts with the whole body temperature of the rotary kiln, the result is fed back to the adjustment basis of the high-temperature fan and the primary fan, the system continuously influences the adjustment, feedback and adjustment by utilizing the mutual correlation of the program modules, the system is continuously optimized in the dynamic production process, and finally the high-quality, high-yield, energy-saving and consumption-reducing economic running state is achieved.
The invention has the advantages that: the burning zone range of the rotary kiln (taking a rotary kiln of 4.8 multiplied by 72m as an example) can increase the burning zone length range of the rotary kiln by 2 to 3m on the original basis, and the improvement of the length of a high-temperature area is greatly beneficial to the improvement of the yield and the quality; on the other hand, the staged combustion technology is a recognized emission reduction method capable of reducing NOx in various industries, and the staged combustion technology is optimized and applied, so that the NOx emission reduction effect is obvious.
Drawings
FIG. 1 is a graph showing the comparison between the flame and the operating conditions of the present invention.
FIG. 2 is an overall process flow diagram.
FIG. 3 is a layout diagram of kiln head processing equipment.
The reference numbers indicate that 1, a decomposing furnace, 2, a rotary kiln, 3, a kiln head part, 4, a burner, 5, a kiln tail flue gas analysis sampling point, 6, a preheater, 7, an adjustable oxygen-enriched nozzle and 8, a high-temperature fan.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, and the scope of the present invention will be more clearly and clearly defined.
The invention is realized by the following technical scheme: a staged combustion method for saving coal and reducing nitrogen in a rotary cement kiln 2, which is characterized in that,
the oxygen concentration of primary air is changed, and the flame formed by the rotary kiln burner is directionally and accurately supported by oxygen-enriched air, so that the flame of the burner is sequentially divided into three areas from beginning to end: a coal powder volatile matter oxygen-deficient combustion area, a coke initial combustion area and a coke full combustion area.
The flame-shaped air-conditioning system is characterized in that primary air is formed by mixing two paths of air with different oxygen concentrations, one path is common air, the other path is oxygen-deficient air with the oxygen concentration lower than 20.9%, and the air volume of the mixed primary air meets the requirement of the air speed of internal air and external air required by flame shape adjustment. On the premise of meeting the requirement of combustion regulation of volatile matters of the pulverized coal, the primary air oxygen concentration is reduced as much as possible, and the oxygen-deficient combustion of the volatile matters is realized.
The device is characterized in that electric regulating valves are arranged on two air branch pipes with different oxygen concentrations, and an oxygen concentration detector is arranged on an outlet pipeline of the primary air fan. Under the control of a PLC program, two paths of air with different oxygen concentrations are regulated according to the air volume and the oxygen concentration requirements of primary air, and the accurate control of the air volume and the oxygen content of the primary air is realized.
The method is characterized in that the rotating speed of the high-temperature fan is reduced according to a certain frequency and speed, the air quantity of the system is reduced, the temperature of secondary air is reduced by the air quantity of the system, the pyrolysis temperature of the pulverized coal is further improved, and the staged combustion effect (namely the strength of the oxygen-deficient atmosphere in the combustion stage of the volatile matters of the pulverized coal) is improved.
The method is characterized in that high-pressure oxygen-enriched air with oxygen concentration higher than 20.9% is introduced from the outside and is sprayed into the initial combustion area of the flame coke of the burner through a plurality of groups of nozzles, the original oxygen-deficient combustion state of the part is changed, and the combustion speed and the temperature of the coal powder at the part are larger than or equal to those of the full combustion area of the coke.
The method is characterized in that the whole body temperature of the rotary kiln (the angle of the rotary kiln is inclined by 3.5 degrees relative to the vertical direction) is recorded and analyzed through intelligent online analysis software, the flame shape (length and thickness) of the burner is changed by adjusting the opening of the electric air quantity regulating valve for the inside air and the outside air of the burner and the opening of the electric air quantity regulating valve for the inside air and the outside air angle regulating valve for the inside air and the outside air so as to meet the firing requirement, and the defects of high and low local whole body temperature, thinning and lengthening of flame caused by oxygen deficiency combustion and the like are eliminated or improved.
It is characterized by that an on-line flue gas analyzer is added in the tail smoke chamber of rotary kiln, and the waste gas condition produced by combustion of rotary kiln can be monitored at all times, and its composition (O) can be monitored according to the waste gas2、CO、NOX) The adjustment direction of the primary air oxygen concentration and the oxygen-enriched injection quantity is judged.
The method is also characterized in that all the adjusting processes can be analyzed and controlled by a computer through software in a centralized way, and the optimal control and adjustment parameters are found.
Further, the primary air is introduced into the rotary kiln 2 from a primary air fan of the kiln head part 3 through the burner 4, and the secondary air is air obtained by the high-temperature air fan 8.
Further, the secondary air enters the kiln tail smoke chamber through the rotary kiln 2, and the rotary kiln is inclined at an angle of 3.5 degrees vertically.
Furthermore, the adjustable oxygen-enriched nozzle 7 is connected to the outlet of the rotary kiln 2 and is positioned below the access point of the burner 4.
Further, a sampling point of the kiln tail smoke chamber on-line gas is arranged in the kiln tail smoke chamber, and the smoke components from the rotary kiln 2 are monitored.
Further, the above-mentioned oxygen enrichment: oxygen at concentrations greater than 20.9% relative to the oxygen content of air is referred to as enriched oxygen.
The working principle is as follows: the oxygen concentration of primary air is automatically adjusted by using a control program, the oxygen concentration of the primary air is reduced to cause that coal powder is burnt to generate an oxygen-deficient environment and a reducing atmosphere so as to reduce NOx generated in the burning process, and because the oxygen content of the primary air is reduced and the coal powder is burnt late, the flame of the burner 4 can be elongated and thinned, the firepower is reduced, and the burning effect is reduced; the intelligent operation system utilizes the automatic control program again to carry out oriented and accurate oxygenation combustion supporting on the proper part of the initial combustion of the pulverized coal coke, and the combustion hysteresis of the pulverized coal is eliminated; the automatic control system adjusts the air quantity and the angle of the inner air and the outer air of the burner 4 according to the requirements, changes the width and the length of the flame and eliminates the condition that the flame is thinned due to the reduction of the burning speed of the pulverized coal; meanwhile, the automatic control program reduces the rotating speed of the high-temperature fan 8 and the air quantity of the system according to a certain frequency and speed, the air quantity of the system is reduced, the temperature of secondary air can be increased, the pyrolysis temperature of pulverized coal is further increased, and the staged combustion effect (namely the under-oxygen atmosphere intensity in the combustion stage of pulverized coal volatile matters) is improved. The results of the four mutual influences are reflected by the smoke chamber gas detection values O2, CO and NOx concentration and the whole body temperature of the rotary kiln 2, the results are fed back to the adjustment basis of the high-temperature fan 8 and the primary fan, the system continuously utilizes the mutual correlation influence of the program modules to adjust, feed back and adjust, continuous optimization is carried out in the dynamic production process, and finally the high-quality, high-yield, energy-saving and consumption-reducing economic operation state is achieved.
The following steps are finally achieved: because the burning speed and the burnout rate of the coal dust in the rotary kiln 2 are improved, the firepower is enhanced, and the heat formation of the cement clinker is unchanged, the coal injection amount can be reduced under the precondition of stabilizing the quality of the current clinker, and the coal consumption is reduced; on the other hand, the staged combustion technology of the rotary kiln 2 can greatly reduce the generation of NOx in the kiln, and the two technologies are superposed to reconcile the contradiction between energy conservation and emission reduction, thereby forming a win-win situation of unified energy conservation and emission reduction.
The effect is shown in the partial diagram of the flame form and the temperature field of the front rotary kiln 2 and the rear rotary kiln 2: take a rotary kiln 2 of a 5000t/d clinker production line as an example.
Dividing the flame into 4 stages, wherein the temperature of the flame in the 1 st stage of the flame is about 1000 ℃, the combustion of volatile matters is mainly carried out, and the combustion time accounts for 10%; the flame temperature of the 2 nd section of the flame is 800-900 ℃, coke starts to burn at the stage, and the coke is not fully burnt due to oxygen deficiency; the flame temperature of the flame in the 3 rd stage is 1800-2000 ℃, and coke is fully combusted in the stage; the 4 th stage of the flame is that the tail flame temperature is 1300-1400 ℃.
The primary air with the changed oxygen concentration after adjustment can aggravate the 1 st section of the reducing atmosphere of the flame; in the 2 nd section of the flame, due to the injection of the rich oxygen, the temperature of the flame is increased when the combustion is intensified, and is the same as that of the 3 rd section of the flame, and the reducing atmosphere generated by the first part can reduce the part to generate NOx reduction; the 4 th section of the flame almost has no coal dust to continue burning, and the flame can be shortened. The effective burning zone range of the whole rotary kiln 2 has the original 3 rd section and 4 th section 25m, and the extension is that the 2 nd, 3 rd and 4 th sections are 25+2 ═ 27m, which is greatly beneficial to the promotion of the production quality.
Without being limited thereto, any changes or substitutions that are not thought of through the inventive work should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (8)
1. The staged combustion method for saving coal and reducing nitrogen during combustion of a rotary cement kiln is characterized in that the combustion is realized by changing the oxygen concentration of primary air and carrying out directional accurate oxygen-enriched air combustion supporting on flame formed by a rotary kiln combustor, and the flame of the combustor is sequentially divided into three areas from beginning to end: a coal powder volatile matter oxygen-deficient combustion area, a coke initial combustion area and a coke full combustion area.
2. The kiln head part is provided with a primary fan, the primary fan supplies air which is sprayed into a rotary kiln through a burner, one path of the primary air is ordinary air, the other path of the primary air is oxygen-deficient air with the oxygen concentration lower than 20.9%, and the air volume of the mixed primary air meets the requirement of the air speed of internal air and external air required by flame shape adjustment; on the premise of meeting the requirement of combustion regulation of volatile matters of the pulverized coal, the primary air oxygen concentration is reduced as much as possible, and the oxygen-deficient combustion of the volatile matters is realized.
3. The device is characterized in that electric regulating valves are arranged on two air branch pipes with different oxygen concentrations, and an oxygen concentration detector is arranged on an outlet pipeline of a primary air fan; under the control of a PLC system, air inlet valves of two paths of air with different oxygen concentrations are adjusted according to the air volume and the oxygen concentration requirements of primary air, so that the accurate control of the air volume and the oxygen content of the primary air is realized.
4. The method according to claim 1, further characterized in that the rotation speed of the high temperature fan is reduced at a certain frequency and speed, the air volume of the system is reduced, the temperature of the secondary air is increased, the temperature of the secondary air is the hot air temperature of the secondary air, the secondary air is sucked by the high temperature fan, enters the rotary kiln from the head of the rotary kiln and moves towards the preheater, the pyrolysis temperature of the pulverized coal is further increased, and the staged combustion effect (namely the strength of the oxygen-deficient atmosphere in the combustion stage of the volatile matters of the pulverized coal) is improved.
5. The method of claim 1, further characterized in that high-pressure oxygen-enriched air with oxygen concentration higher than 20.9% is introduced from the outside and is injected into the initial burning area of the coke in the flame of the burner through a plurality of groups of nozzles to change the original oxygen-deficient burning state of the area, so that the burning speed and temperature of the coal powder at the area are larger than or equal to those of the full burning area of the coke.
6. The method as claimed in claim 1, further characterized in that the barrel temperature of the rotary kiln is recorded and analyzed by intelligent online analysis software, the angle of the rotary kiln is inclined at 3.5 degrees with the horizontal direction, the flame shape of the burner is changed by adjusting the opening of the electric regulating valve for the internal air quantity and the external air quantity of the burner and the opening of the electric regulating valve for the internal air angle and the external air angle of the burner, so as to meet the firing requirement, and simultaneously eliminate or improve the defects of partial barrel temperature higher and lower conditions, flame thinning and lengthening caused by oxygen deficiency combustion and the like.
7. The method as claimed in claim 1, further characterized in that an on-line flue gas analyzer is additionally arranged in the kiln tail smoke chamber of the rotary kiln, the condition of waste gas generated by combustion of the rotary kiln is monitored at any time, and the adjustment direction of the primary air oxygen concentration and the oxygen-enriched injection quantity is judged according to the monitored components of the waste gas.
8. The method of claim 1, wherein all the adjustment processes can be controlled by a computer through software centralized analysis, and optimal control and adjustment parameters are found, so that the benefits of coal saving, nitrogen reduction, yield increase and quality improvement are maximized.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113336456A (en) * | 2021-07-10 | 2021-09-03 | 阳泉恒跃兴钙业有限公司 | Self-feedback low-nitrogen combustion control method and device for lime burning of rotary kiln |
| CN113566563A (en) * | 2021-06-16 | 2021-10-29 | 福建三明南方水泥有限公司 | Combustion control method of intelligent rotary kiln |
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2020
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| US5413476A (en) * | 1993-04-13 | 1995-05-09 | Gas Research Institute | Reduction of nitrogen oxides in oxygen-enriched combustion processes |
| US20020061489A1 (en) * | 2000-11-20 | 2002-05-23 | Svedala Industries, Inc. | Air injection for nitrogen oxide reduction and improved product quality |
| CN102954687A (en) * | 2012-11-13 | 2013-03-06 | 阿克苏天山多浪水泥有限责任公司 | Local oxygen-enriched combustion system of cement decomposition kiln |
| CN103175394A (en) * | 2013-03-01 | 2013-06-26 | 大连易世达新能源发展股份有限公司 | Energy-saving emission-reducing partial oxygen-increasing combustion-supporting device used for cement kiln |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113566563A (en) * | 2021-06-16 | 2021-10-29 | 福建三明南方水泥有限公司 | Combustion control method of intelligent rotary kiln |
| CN113336456A (en) * | 2021-07-10 | 2021-09-03 | 阳泉恒跃兴钙业有限公司 | Self-feedback low-nitrogen combustion control method and device for lime burning of rotary kiln |
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